Is it a boy?

[fluffycrow]

It's definitely a cockerel, and mostly judging by the comb and wattles, as for the new guys you posted, they're cockerels for the same reason, but also because you can see pointy feathers on their saddles

 

[MysteryChicken]

And you are sure because? (So I know how to tell). Thanks.

 

[PolloGal]

Got it! Thank you!

 

[MysteryChicken]

Got it! Thank you!

You're welcome.

 

[The Birb King]

Yes